Pulverized-fuel-feeding apparatus



Dec. 18, 1928.

H. KRElSlNGER PULVERIZED FUEL FEEDING APPARATUS Filed Sept. 12, 1925awwewtoz Elf/tom W 7 ZLMMW Patented Dec. 18, 1928.

'UNITED STATE/S PATENT OFFICE."

HENRY KREISINGER, OE IIERMONT, NEW

YORK, ASSIGN OR TO INTERNATIONAL COM- BUSTION ENGINEERING CORPORATION,OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

PULVERIZED-FUEL-FEEDING APPARATUS.

Applicatibn filed September 12, 1925. Serial No. 55,906.

This invention relates to pulverized fuel systems and particularly-tothe feeding of the fuel.

One of the difficulties encountered in this art is bridging of the fuelin the storage bins from which the fuel is fed to burners or elsewhere.

When the coal in the bin bridges or arches,

feed will cease as soon as the coal below the arch has been removed.This bridging usually occurs. in the lower portion of the bin and it iscustomary to break the arch or bridge by opening of the exterior of thebin with asledge hammer. I

It is the primary object ofthe present invention to prevent thisdifficulty and secure a uniformity of feed.

How the foregoing, together with such other objects as may hereinafterappear, or

are incident to my invention are realized,

meral 7 indicates the bill or hopper, which isusually rectangular incross section and which is adapted to discharge into the throat portion8, below which is the feed screw 9 i I slope of thesides of the binadapted to discharge the pulverized fuel into the line-10 leading to theburners or elsewhere. The throat is controlled by'the usual,

gate 11. i

To prevent the arching or bridging above described I locate'a grid A inthe lower portion of the bin 7. This grid is preferably composed of aplurality of thin bars 12.

These bars are preferably from to 4 inch thick and'about 1'to 1% incheswide and h they are place apart about 2 inches with the edges up, i. e.,in the direction of the flow.

The grid may be. supported in any suitable way and. in the presentInstance I'have sloped the end plates 13 of the grid the same as the sothat the grid automatically positions itself.

I have found that such a grid overcomes this difficulty altho one wouldsuspect that the presence of such a number of plates would interferewith rat-her than promote proper. flow. I assume the arching or bridgingabove referred to is poduced by unevenness in flow in various portions.of the coal and that the effect of the bars on the grid is to produceanuniform flow cross sectionally of the bin. Whatever the reasontherefor'may be, I have found by actual experience that the deviceprevents arching.

I claim: g

1. In coal handling apparatus, a gravity discharge bin or reservoir forpulverized coal, feeder mechanism therefor, and a grid in the bin abovethe feeder mechanism, said grid comprising a plurality of stationaryspaced bars.

' 2. In coal handling apparatus, a gravity discharge bin or reservoirfor pulverized coal, feeder mechanism therefor, and a grid in the binabove the feeder mechanism, said 1 grid comprising a plurality ofstationary spaced bars, said bars being in the form of.

plates with the edges in the line of flow.

3. In a coal handling apparatus, a gravity discharge. bin or reservoirfor pulverized coal having a hopper shaped bottom with a dischargeoutlet, feeder mechanism there for, and a grid in the bin comprising aplurality of spaced bars extending across the hopper I shaped portion ofthe bin well abovethe dischar e outlet.

4. In acoal handling ap aratus, a gravity discharge bin or reservoir orpulverized coal having a restricted discharge outlet, feeder .mechanismtherefor, and a grid in the bin comprising a plurality of spaced barsextending across the bin well above the discharge outlet. 4

5. In a coal discharge bin or reservoir for pulverized Tcoal. aving ahopper shaped bottom with a. discharge outlet, feeder mechanismtherefor, and agrid in the bin comprising a plurality of sgaced' barsextending across the hopper s apedporti'on of the bin and resting on thewalls thereof. p

In testimony whereof, I have hereunto signed my n'amef HENRY KREISINGER.

handling apparatus, a gravity"

